When the season ended last month Red Sox chief baseball officer Craig Breslow identified several areas of need he expected to focus on this offseason. One was improving the club’s rotation, specifically by adding a frontline starter who could potentially start a playoff game.

Tuesday morning, Breslow did just that.

This week the Red Sox made their first big move of the winter, acquiring veteran right-hander Sonny Gray and cash considerations from the St. Louis Cardinals in exchange for right-hander Richard Fitts, left-handed pitching prospect Brandon Clarke and either a player to be named later or cash.

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The 36-year-old Gray is a three-time All-Star who immediately slots into the top of Boston’s rotation behind ace Garrett Crochet and alongside Brayan Bello, but can he

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